1. in + 月/ 年
2. between … and …
3. from … to …
4. over the period from … to …
5. in the year between … and …
6. in the 3 years spanning from 2001 through 2004
7. for the first 3 months
8. for/ during/ over the next / following 6 months
9. for/ during/ over / in a period of 4 months
10. for/ during/ over / in a 4- month period
11. over/ for / during the same period
12. from then on / from this time/ point onwards / since then
13. by the year of …
after / before + 年/ 月
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